F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
342/37, 342/38,
F04B 17/04 (2006.01) F04B 35/04 (2006.01)
Patent
CA 1286915
ABSTRACT OF THE DISCLOSURE A low pressure metering pump having a hollow piston reciprocated in a cylindrical guide by a solenoid coil. A pair of check valves provide for unidirectional fluid flow through the cylindrical guide in response to the reciprocation of the piston. A seal attached to the piston prohibits a fluid backflow between the external surface, of the piston and the internal surface of the cylindrical guide. A bumper seal at the output end of the piston prevents Fluid flow through the cylindrical guide when the solenoid coil is de-energized. A control circuit period k ally energizes the solenoid coil at a frequency determined by a variable resistance responsive to prede- termined operational parameters. In a preferred embodiment, the metering pump is a fuel control element for a heater and the variable resistance is a thermistor or similar type of temperature sensitive resistance, which controls the rate at which fuel is delivered to the heater.
538029
Brown Ralph V.
Facet Enterprises Inc.
Marks & Clerk
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